TYVEK® IsoClean® hood and mask, option MS HOOD: Clean-processed and gamma-sterilized. Bound internal seams. Bound head opening. Ties with loops for adjustable fit. MASK: Pleated polyethylene outer. 17.5 cm wide. Sterile. Blue. Items packed in a dual barrier validated packaging system (double bagged). Available sizes: one size For cleanrooms up to ISO 5, GMP A/B CLEAN PROCESSED + STERILE.